WHATS WRONG

I OWN A 2000 FORD EXPLORER. IT RUNS GREAT BUT IT SOUNDS ROUGH.. IT KNOCKS
BUT NOT TOO LOUD.. THE HEADS WERE CHANGED ABOUT THREE MONTHS AGO. IT WAS

DOING FINE BUT, WHEN I RAN A TEST A FEW DAYS AGO, IT READ " SYSTEM
ADAPTIVE FUEL TOO LEAN (BANK ONE AND BANK TWO)" WHAT COULD BE THE CAUSE,
OF THIS MALFUNCTION. IT SEEMS TO ACCELERATE THEN DECELERATE WHENEVER I
CHANGE IT FROM PARK TO DRIVE, OR REVERESE TO NEUTRTAL...WHATS WRONG

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